Allow user agent to wait or reject the request before any fetch

[npm1]

See #675

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[cbiesinger]

isn't this redundant with https://w3c-fedid.github.io/FedCM/#create-identity-credential:~:text=The%20user%20agent%20can%20decide%20when%20to%20continue%20with%20the%20next%20steps. ?

[npm1]

isn't this redundant with https://w3c-fedid.github.io/FedCM/#create-identity-credential:~:text=The%20user%20agent%20can%20decide%20when%20to%20continue%20with%20the%20next%20steps. ?

Yea I was just updating since I saw that. Unfortunately that is not good enough since it does not allow rejecting, so moved it to right at the beginning of the create algorithm.

[cbiesinger]

Thanks, that looks good.